某农场有耕地1000亩,种粮食、棉花和蔬菜.其中蔬菜用地a亩,粮食用地比蔬菜用地的6倍还多b亩,求棉花用地多少亩?当a=120,b=4时,棉花用地多少亩?
人气:193 ℃ 时间:2020-02-01 07:26:26
解答
粮食的亩数是:6a+b,
则棉花有:1000-a-(6a+b)=1000-7a-b.
当a=120,b=4时,原式=1000-7×120-4=156(亩).
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